My car was burning oil like mad and I posted the same question on this website. I then looked at what other people said on this site and found out that a valve seal job costs $50 in parts and 2 1/2 hours of labor. so instead of paying $400-2000, I paid $280 and my car is not leaking any oil. These repair shops are trying to rip us off. I feel like a genius. I'm glad to pass this info on to others!